INDEX 



211 



Individual, organic: fundamental 

 characteristics of, 2; nature of 

 unity in, 3, 48, 175; various 

 theories of, 3, 22; character of 

 order in, 8, 17, 35; reproduction 

 in relation to, 12; terminology 

 of, 18; comparison of, with 

 social individual, 21, 26, 206; 

 formulation of the problem of 

 the, 29; dynamic conception of 

 the, 29, 88, 172; as one or more 

 metabolic gradients, 40, 170; 

 limitation of size of, 45, 47, 151; 

 as result of relation between pro- 

 toplasm and environment, 49; 

 origin of adventitious, in plants, 

 83, 154, 194; size of, in relation 

 to range of dominance, 151; 

 fundamental reaction system of, 

 188; difference between plant 

 and animal, 189; in relation to 

 inheritance, 202; significance of 

 dynamic conception of, 205. See 

 also Axis; Dominance; Indi- 

 viduality; Individuation. 



Individuality: different kinds of, 

 48; superficial origin of organic, 

 49. See also Axis; Dominance; 

 Individual; Individuation. 



Individuation: in Amoeba proto- 

 plasm, 6; in experimental re- 

 production, 14; nature of, 41, 

 48; in "rings" in Harenactis, 

 146; conditions determining 

 low degree of, in plants, 189; in 

 corals, 197; degree of, in egg, 

 201; fundamental identity of, 

 in organisms, 205. See also 

 Axis; Dominance; Individual; 

 Individuality. 



Inheritance: of metabolic gradi- 

 ents, 41, 182; in relation to or- 

 ganic individual, 202; in relation 

 to different reproductive pro- 

 cesses, 202; of "acquired char- 

 acters," 204. 



Inhibition: of head-formation in 

 Planaria, 112, 141; in reconsti- 

 tution of Tubularia, 135; of 

 growing shoots in plants, 153; 

 in apical direction in plants, 



155; by leaves in plants, 156; 

 of root-formation by roots, 159; 

 non-specific character of, in 

 plants, 168; nature of, 178. 



Irritability: increase of, by re- 

 peated excitation, 33, 204; gra- 

 dient of, 34, 180. 



Isolation, physiological: condi- 

 tions determining, 45; effect of, 

 46; infrequency of, in higher 

 forms, 47; in agamic reproduc- 

 tion in Tubularia, 92; in agamic 

 reproduction in Planaria, 94; 

 experimental, in Tubularia, 135; 

 experimental, in Planaria, 141; 

 experimental, in plants, 152; as 

 the basis of agamic reproduc- 

 tion, 192; different conditions 

 determining, 193; in relation to 

 reduplication of parts, 195. See 

 also Dominance. 



Lumbriculus, experimental control 

 of reconstitution in, 118. 



Marchantia: experimental repro- 

 duction in, 86; localization in, 

 as resultant of different axes, 

 165. 



Metabolism: characteristics of, 

 15; relation of, to protoplasm, 

 16; susceptibility in relation to, 

 5 1 ; increase in rate of, after sec- 

 tion in Planaria, no; rate of, in 

 relation to differentiation, 183, 

 190; rate of, in relation to sta- 

 bility of structure, 191. See 

 also Gradients; Individual; Ir- 

 ritability. 



Metzgeria, agamic reproduction in, 

 83. 



Moss, developmental gradient in 

 embryo of, 73. 



Nervous system: in relation to 

 metabolic gradients, 40, 61, 175; 

 superficial origin of, 49; meta- 

 bolic gradient in cells of, 62, 151, 

 173; independent formation of, 

 in reconstitution, 114; supposed 



